在不完美的資本市場下，廠商的內外部融資彼此間為不完美的替代品，此時即使廠商有淨現值大於零的投資計畫，若外部資金因成本過高而無法取得，而其內部資金也已使用完畢，則廠商只好放棄此項投資計畫．此種因為資金不足而使投資計畫所受到的限制，我們稱為融資限制(Financing Constraints)． 對於面臨融資限制的廠商而言，由於其投資較依賴內部資金，故我們在其投資方程式中加入流動性變數時，此變數之係數應顯著．而對於未面臨融資限制的廠商而言，由於其投資較不依賴內部資金，故其投資方程式中流動性變數之係數應不顯著．

本研究即是使用八種廠商屬性，將廠商分成兩組，一組有面臨融資限制，一組未面臨融資限制，分別估計兩者加入流動性變數後的投資方程式，再觀察兩組廠商其流動性變數之係數是否有所差異，如此便可明瞭融資限制的存在是否能影響台灣廠商的投資．本研究使用的八種廠商屬性如下：(1)是否屬於集團．(2)所有權結構．(3)上市時間．(4)公司規模．(5)是否發放現金股利．(6)是否為製造業．(7)是否發行可轉換公司債．(8)是否發行商業本票．在實證結果上，雖然只有所有權結構

中文部份
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3 林炯垚，"半強勢效率市場按定之實證方法"管理評論，民國77年7月，pp.45-68。
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5. 陳慧娟11 我國上市公司資本結構、成長與T。bin's Q關連之研究"私立東吳大學會計研究所未出版碩士論文，民國84年6月。
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